NAME | DESCRIPTION | INSTALLATION | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON
PMDAZSWAP(1) General Commands Manual PMDAZSWAP(1)
pmdazswap - zswap (compressed swap) PMDA
pmdazswap is a Performance Metrics Domain Agent (PMDA) which exports metric values about compressed swap operation, as tracked by the zswap Linux kernel module. Zswap is a lightweight compressed cache for swap pages. It takes pages that are in the process of being swapped out and attempts to compress them into a dynamically allocated RAM-based memory pool. Zswap trades CPU cycles for potentially reduced swap I/O. This tradeoff can also result in a performance improvement if reads from the compressed cache are faster than reads from a swap device. This PMDA exports metrics about pool size, number of pages stored, and various counters for the reasons pages are rejected.
Install the zswap PMDA by using the Install script as root: # cd $PCP_PMDAS_DIR/zswap # ./Install To uninstall, do the following as root: # cd $PCP_PMDAS_DIR/zswap # ./Remove pmdazswap is launched by pmcd(1) and should never be executed directly. The Install and Remove scripts notify pmcd(1) when the agent is installed or removed.
$PCP_PMDAS_DIR/zswap/Install installation script for the pmdazswap agent $PCP_PMDAS_DIR/zswap/Remove undo installation script for the pmdazswap agent $PCP_LOG_DIR/pmcd/zswap.log default log file for error messages from pmdazswap
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5).
PCPIntro(1) and pmcd(1).
This page is part of the PCP (Performance Co-Pilot) project. Information about the project can be found at ⟨http://www.pcp.io/⟩. If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-16.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com Performance Co-Pilot PCP PMDAZSWAP(1)